FLOWERING PLANTS
Angiosperms produce pollen and eggs in specialized reproductive structures called flowers.

The stamen of a flower consists of a filament and anther. The anther contains microsporangia in which meiosis occurs to produce the microspores that will develop into pollen, the immature male gametophyte.

Female reproductive parts (pistils) consist of an ovary, style, and stigma. Within the ovary are individual ovules, each of which contains a megasporocyte that will undergo meiosis to form four megaspores. One of these megaspores will develop into the female gametophyte, which will produce an egg nucleus.